Project Skyhook seeks to anchor artificial satellites in space but they keep getting knocked down by forces Dr. Russell Marvin (Hugh Marlowe) doesn't understand. While monitoring his latest attempt Marvin and his new bride Carol (Joan Taylor) are two of the few survivors when flying saucers land at the rocket base. When fired upon, they retaliate by blowing the installation to bits with powerful energy rays. At first the intentions of the saucer men are in doubt, but soon it becomes apparent that their aim is to conquer the world. In a secret lab, Mr. and Mrs. Marvin perfect radio weapons that will hopefully interrupt the saucer's levitation beam. And they'd better get them working quickly, as a fleet of the spinning discs is heading toward Washington, D.C.!